APA (7th ed.) Citation

Mary Marguerite, s. (1942). These are our friends .. Ginn and Co.

Chicago Style (17th ed.) Citation

Mary Marguerite, sister. These Are Our Friends .. Boston, New York [etc.]: Ginn and Co, 1942.

MLA (8th ed.) Citation

Mary Marguerite, sister. These Are Our Friends .. Ginn and Co, 1942.